diff --git a/taxcalc/calculator.py b/taxcalc/calculator.py
index 353d09959..d0b92a598 100644
--- a/taxcalc/calculator.py
+++ b/taxcalc/calculator.py
@@ -1248,7 +1248,7 @@ def lines(text, num_indent_spaces, max_line_length=77):
                         else:  # if baseline is GrowDiff object
                             # each GrowDiff parameter has zero as default value
                             doc += '  baseline_value: 0.0\n'
-            del mdata_base
+                    del mdata_base
             return doc
 
         # begin main logic of reform_documentation